Fishing tool



April 21,' 1925. 1,534,229

G. R. LNE-Recon FISHING TOOL Filed July 12: 1924 s sheets-sheet 1 A,ga-vu.

Sttomwg @ma 2,r i925. r,534,229

G. R. LIVERGOOD FISHING TOOL Filed July 12, 1924 3 Sheets-Sheet 3 2O zo6 lzqz /7 17 P i-g. 6. gm@- and willfthus be Patented Apr. 21, 1925.

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esa-Amia- LIYeReQQD, `.Oli HQUSTQN.

.j rIsamGrQOL- Application filed July 12,

To vall w/iom z'zf may eminem.'

Be it known thatL'GurALn R. Liviinooon, a citizen of the UnitedV States,'residing at Houston,l Harris County, rFeiras, have invented a certainnew and useful improvement in Fishingflools, of which the `following isa specification.

"ll/Iy inveiitionrelates tolishing tools for use in well drillingoperat-ionsand has particular `reference vto fishingl 'tools forVengaging small lumpsfof steel or tools broken oil' in the well, andretaining said'broken parts so that t-hey lmay be withdrawn from thehole. It is an object of the invention to provide ardevice adapted toydischarge a quantity of quick setting hydraulic cement about vthelishing tool and the junk'so thatthe broken partswill be'e'mbedded inthe A'cement and maythus be withdrawn with' the tool :trom the wall.

i It isi also desired to Aprovide a `tishing tool which'maybe operatedpositively without `the assistance of springs oi" threaded'partsV ladapted to work'ett'ectively vat all times. I i 'Y 'i Referring to thedrawings herewith Fig.

1 is a central longitudinal section through theftoo'l constituting myyinvention shownas 30 placed within a wellmhole.` Fig`.` 2 is a trans-Aversesectio'nf onwtliewplane 2-#2'0V Fig. 1.

Fig. 3 isa similar section yonthe plane 3-3 Y ofF ig. 1. Fig. tis asection similar tothat shown in 1 illust-rating the parts indiiierentpositions. a central longitudinal sectioiithrough a slightlydifferent embodiment'bt my invention certain parts bieiiig'showninc-levation andFig. G is a vertical section showing Ithe'upper andlower ends vinside elevation andillustrating rthe partsfin diierentposition'than shown vin Fig. 5. Like numerals of refe'renc'eare appliedto like parts in all views.

In the device ydisclosed in'Figs. 1 to 4l, inclusive, I. have shownacentral sectionl of pipe 1 forming a cylinder to receive a piston 2.The upper .end the cylinder 1 is screwed within vthe lowerend of specialcollar 3, the upper end of which is threaded at t for attachment to thedrill stem 5. The collar 3 has a central partition or diaphragmlG'enrtending across the saine and closing the passagetherethrough'except yfor 4 openings 7, 7 and S, 8. n The openings 7provide apassage for.y flushing j fluid, which j may' be l1924. i SerialNo. 725,608.

"holds in position a valve seat 14 in which is placed a ball valve 15.

At the lower end of the cylinder 1 is a collar 16, which is connected atits lower end with a swedged nipple 17.' A central parti4 tion`18extends across coupling 16 Vand has a certain valve seat 19 to receive avalve 20.

'The said valve has a downwardly extending steni 21, whiclris ofsuliicient length to project beyond the lowerend Aof the nipple 17. Thevalve 20 is held within its seat by a spiral spring 22, bearing at itsupper end against the plate or partition 18 and at its lower end againsta kcollar 23 secured rigidly to the valve stem 21, asshown inthedrawing.

The swedged nipple 17 forms ashoe for the lower end of the device, andis formed with a downward projection 2a, so that it may better berotatedinto position at-.the bottomof the hole to engage the brokenparts which are to 'be removedfand I also provide a plurality ofpins25`extending through the wall ot the shoe 17 in a radial direction, thepurpose being to provide a retaining means for the cement which is to beemployed.

The piston 2 has cups 26 thereon to en- Oage the in `v`er walls of thecylinder 1 in the usual manner.

i Vhen this device is to be operated the cylinder 1 is filled with aquick setting hydraulic cement, and thel piston' isthenplaced in theupper end of the cylinder 'and the set screws9 are adjusted to force thepiston downwardly against the cement so that there will be no liabilityof `theinud or water being forced into the cylinder during its descentinto the. well. The other7 parts are then assembled into position andthe tool is introduced in the well until the tvalve stem 21 contactswith the bottoni 'ofthe hole. The

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shoe 17 Vwill be forced downwardly against the bottom, and the devicewill be ready for operation. During the passage of the tool into thewell the mnd and water in the hole may pass inwardly through the channeland past the valve l5 into the drill stem.

The pumps are then operated to force flushing fluid downwardly throughthe drill stem and the openings 7 in the partition 6 to exert a pressureupon the piston 2. The valve will close so that the full pressure of thepumps may be exerted upon the piston. The piston will thus force thecement through the shoe 17 and past the valve 2O and fill the lower endof the hole as'shown in Fig. a. Any broken pieces of tools such as shownat 26, will be embedded in the cement and the inwardly projecting pinsof the shoe 17 will also be embedded in the cement, so that when thecement is properly set the complete device may be rotated slightly tofree it from the wall of the hole and the device mav be withdrawnbringing with it the pieces of junk.

It will be obvious that this type of tool may be constructed cheaply andoperated without difl'iculty. It obtains a firm grip upon the pieces ofbroken metal in the hole and when the tool is withdrawn the brokenpieces are included and there is no further danger oi their becomingloosened and dropped. It will be noted that this device will operatepositively and is not dependent upon springs or upon the rotation of thepipe, andV for this reason will work effectively on each operation. Itwill be cheap and economical to use and efficient in its working.

In the construction shown in Figs. 5 and 6, the parts are practicallyidentical with those shown in the previous embodiment, except that thecylinder l is considerably longer and is formed with a plurality ofopenings 2T suitably spaced somewhat above i, the middle portion of thelength of the cylinder. The piston QS is also formed with a plunger 29connected therewith by a connecting rod 30.`

T his construction of the cylinder and the piston therein enables theoperator better to determine when the cement is fully discharged fromthe cylinder. Thus, when the pressure of the pumps is exerted upon thepiston to force the cement from the device, the pressure will be exertedupon the piston 28, which will force the plunger 29 and the cementdownwardly until the cement is ,entirelyv discharged. At this point theupper end of the piston 28 will reach the position shown in Fig. 6 sothat the flushing fluid may be discharged through the openings 27 behindthe piston. rIhe operator will thus determine by theaction of his pumpwhen theV piston has been forced downwardly a suticient distance torelieve the pressure on the cylinder by the discharge of the fluidthrough the openings 27. The operator will then shut oft' his pump andwait for the cement to set, after which the tool may be withdrawn.

The Operation of the device will now be clear without furtherdescription. lVliat I claim as new and desire to protect by LettersPatent is:

' l. In a fishing tool for wells, a cylinder, a piston therein, avalve-controlled opening below said piston, a shoe secured to the lowerend of said cylinder, a closure for the upper end of said cylinderhaving openings .therein for the passage of flushing fluid and means toraise the valve from its seat in said opening when the device is lowered.to the bottom of the well, whereby flushing fluid may be pumped throughsaid openings against said piston to force it downwardly within saidcylinder, for the purpose described.

2. In a fishing tool for wells, a cylinder adapted to contain a chargeof cement, a piston therein about said cement, a drill stem, a collarbetween said drill stem and said cylinder, said collar having apartition therein with openings in said partition to allow the passageof flushing fluid therethrough, a shoe secured to the lower end of saidcylinder, a partition at the lower end of said cylinder having a valveclosed opening therein, means to hold said valve at its seat, and meansto raise said valve from its seat operated by contact with the bottom ofthe hold.`

3. In a fishing tool for wells, a cylinder for hydraulic cement, apiston in said cylinder, a valve controlled closure for the lower end ofsaid cylinder, a partition above said cylinder having passagetherethrough for flushing fluid, means in said partition to control thepassage of fluid upwardly into the drill stem above said partition, andmeans to automatically unseat said valve.

4. In a fishing tool for wells, a cement retaining shoe, a collar onsaid shoe, a cylinder on said collar, a piston in the upper end of saidcylinder automatically opening means to retain cement in said cylinder,and means to force said piston downwardly on said cement.

5. In a fishing tool for wells, a collar having a central valve seattherein, a valve in said seat, a downwardly extending stem on saidvalve, a shoe on said collar around said valve stem, inwardly projectingradial pins in said shoe, a cylinder above said collar for cement andmeans to force said cement past said valve when said valve stem comesinto contact with the bottom of the well.

6. In a fishing tool for wells, a guide shoe, a container thereon forcement, means to retain said cement in said container while it is being'lowered into the well, means to torce said Cement i'rom said containerinto said shoe and means to retain said cement in Contact withsaid'shoe.

T. In a ishing tool for Wells, a guide shoe, a collar thereon, anupwardly Opening valve in said collar, a cement containing cylinder onsaid collar, means to raise said valve when the shoe is on the bottom otthe Well, and means to force said cement past said valve.

8. In a fishing tool for Wells a container for cement, an automaticallyopening Valve at the lower end of said Container, hy-

dranliealiy ope ated means to force said cement from said container, andmeans below said container to retain said cement in engagement with saidtool.

9. In a fishing tool for Wells a guide shoe, a Cylinder above said shoe,means to retain Cement in said cylinder, means to release said cement atthe bottom of the Well, means to discharge said cement and means toWithdraw said tool and cement from the weil.

In testimony whereof I hereunto affix my signature this 9th day of July,A. D. 1924.

I GERALD R. LIVERGOOD.

